Build a way to utilize the parallelization of jobs in Github actions to run built in parallel

[giltayar]

The idea is this:

• A pre-commit gets the dependency graph and builds a Github Actions workflow file
• The first job is a special job that figures out what packages need to be built (using bilt libraries) and creates outputs per-package using ::set-output
• There will be one job per-package
• Each job will use jobs.job.needs to define the dependency it has on other jobs/packages
• Each job will use jobs.job.if to check the output of the special job to see if it needs to run

And that should work!

Needs product definition